Whether this is sufficient depends on whether the string it matches and replaces, must be able to contain a '@'. Well, you can write strings like "blah blah @foo@@@@bar@ blah" where both "foo" and "bar will get the special treatment, and the "@@" in the middle of the quadruple will be replaced by a single "@". I guess that will probably suffice.

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Re^7: Find pieces of text in a file enclosed by `@` and replace the inside
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